Spatial noise filtering through error correction for quantum sensing
Spatial noise filtering through error correction for quantum sensing
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DOI：
10.1038/s41534-018-0082-2
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发表时间：
2017-08
影响因子：
7.6
通讯作者：
David Layden;P. Cappellaro
中科院分区：
文献类型：
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作者：
David Layden;P. Cappellaro
量子系统可以高精度地测量其环境中的各种量。然而，它们的灵敏度往往受到同一环境的退相干效应的限制。动态解耦方案被广泛用于从信号中滤除环境噪声，但其性能受到信号和噪声的频谱特性的限制。因此，量子纠错方案作为一种没有相同限制的补充技术而出现。然而，迄今为止，他们未能纠正许多量子传感器中的主要噪声类型，这些噪声以与信号相同的方式耦合到传感器中的每个量子位。在这里，我们展示了量子误差校正如何纠正这种噪声，而动态解耦只能部分解决这种噪声。动态解耦利用信号和噪声中的时间噪声相关性，而我们的方案利用空间相关性。我们给出了小量子器件的明确例子，并演示了一种方法，通过该方法可以根据其噪声定制纠错码。
Quantum systems can be used to measure various quantities in their environment with high precision. Often, however, their sensitivity is limited by the decohering effects of this same environment. Dynamical decoupling schemes are widely used to filter environmental noise from signals, but their performance is limited by the spectral properties of the signal and noise at hand. Quantum error correction schemes have therefore emerged as a complementary technique without the same limitations. To date, however, they have failed to correct the dominant noise type in many quantum sensors, which couples to each qubit in a sensor in the same way as the signal. Here we show how quantum error correction can correct for such noise, which dynamical decoupling can only partially address. Whereas dynamical decoupling exploits temporal noise correlations in signal and noise, our scheme exploits spatial correlations. We give explicit examples in small quantum devices and demonstrate a method by which error-correcting codes can be tailored to their noise.